Successfully reported this slideshow.

Cell cycle & cell division

2,623 views

Published on

Cell cycle & cell division

Published in: Education, Technology
  • Be the first to comment

Cell cycle & cell division

  1. 1. The Cell Cycle & Cell DivisionBy Muhammad Iqbal Khan SS Biology Email ID: mikhan1313@yahoo.com
  2. 2. Cycle Process
  3. 3. Cell Cycle 1-Inter Phase 2-Mitotic Phase G1 Phase Karyokinesis S Phase Cytokinesis G2 Phase
  4. 4. The Cell Cycle http://www.nobel.se/medicine/laureates/2001/press.html
  5. 5. Animated Cycle http://www.cellsalive.com/cell_cycle.htm
  6. 6. MITOSIS
  7. 7. Mitosis The process of cell division which results in the production of two daughter cells from a single parent cell. The daughter cells are identical to one another and to the original parent cell.
  8. 8. Mitosis can be divided into stages • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis
  9. 9. Interphase The cell prepares for division • Animal Cell – DNA replicated – Organelles replicated – Cell increases in size • Plant Cell – DNA replicated – Organelles replicated – Cell increases in size
  10. 10. Interphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  11. 11. Prophase The cell prepares for nuclear division • Animal Cell – Packages DNA into chromosomes • Plant cell – Packages DNA into chromosomes
  12. 12. Prophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  13. 13. Metaphase The cell prepares chromosomes for division • Animal Cell – Chromosomes line up at the center of the cell – Spindle fibers attach from daughter cells to chromosomes at the centromere • Plant Cell – Chromosomes line up at the center of the cell – Spindle fibers attach from daughter cells to chromosomes at the centromere
  14. 14. Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  15. 15. Anaphase The chromosomes divide • Animal Cell – Spindle fibers pull chromosomes apart – ½ of each chromosome (called chromotid) moves to each daughter cell • Plant Cell – Spindle fibers pull chromosomes apart – ½ of each chromosome (called chromotid) moves to each daughter cell
  16. 16. Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  17. 17. Telophase The cytoplasm divides • Animal Cell – DNA spreads out – 2 nuclei form – Cell wall pinches in to form the 2 new daughter cells • Plant Cell – DNA spreads out – 2 nuclei form – New cell wall forms between to nuclei to form the 2 new daughter cells
  18. 18. Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  19. 19. Mitosis Animation http://www.cellsalive.com/mitosis.htm
  20. 20. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase
  21. 21. Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase
  22. 22. MEIOSIS
  23. 23. Meiosis Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. One parent cell produces four daughter cells. Daughter cells have half the number of chromosomes found in the original parent cell
  24. 24. Meiosis During meiosis, DNA replicates once, but the nucleus divides twice.
  25. 25. Meiosis Four stages can be described for each division of the nucleus.
  26. 26. Meiosis I First division of meiosis
  27. 27. First Division of Meiosis • Prophase 1: Each chromosome duplicates and remains closely associated. These are called sister chromatids. • Metaphase 1: Chromosomes align at the center of the cell. • Anaphase 1: Chromosome pairs separate with sister chromatids remaining together. • Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the chromosome pair.
  28. 28. Prophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  29. 29. Prophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  30. 30. Metaphase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  31. 31. Telophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  32. 32. Meiosis Second Division of Meiosis
  33. 33. Second Division of Meiosis • Prophase 2: DNA does not replicate. • Metaphase 2: Chromosomes line up at the center of the cell • Anaphase 2: Centromeres divide and sister chromatids move separately to each pole. • Telophase 2: Cell division is complete. Four haploid daughter cells are formed.
  34. 34. Prophase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  35. 35. Metaphase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  36. 36. Telophase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
  37. 37. Meiosis http://www.biosci.uga.edu/almanac/bio_103/notes/apr_3.html.
  38. 38. Meiosis Animation http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/movie/meiosis.htm
  39. 39. Differences in Mitosis & Meiosis • Mitosis – Asexual – Cell divides once – Two daughter cells – Genetic information is identical • Meiosis – Sexual – Cell divides twice – Four haploid daughter cells – Genetic information is different
  40. 40. Comparison Animations http://www.pbs.org/wgbh/nova/baby/divi_flash.html http://www.usoe.k12.ut.us/curr/science/sciber00/7th/ge netics/sciber/animatin.htm To See live phases of Mitosis and Meiosis click on the above links by pasting in window bar or Email us on: mikhan1313@yahoo.com Muhammad Iqbal Khan SS Biology

×